I went to this library about 15 years ago. I do not recall any food forest type vegetation at the time.
This happened allot in S. CA. My great-grandfather, grandfather, and family, had a similar food forest in Garden Grove with species from around the world. They were all botanists. My great-aunt even brought in 'pocket monkeys' from S. America who swung in the trees for years until a deep frost hit one year.
I have pictures and lots of stories. Unfortunately, when my grandfathers eldest brother retired he sold the property to a man from Japan. You would think that would be a good thing, but the man was odd, he bull-dozed all of it, and put in crushed white rock. It makes me so sick. When my family sold it to him they also subdivided the property and the well paperwork says they found redwood trees at 300 feet.
I revisited the place about 10 years ago and the man was still living there and so was the crushed white rock